package com.edu.gateway.filter;

import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

@Slf4j
@Component
public class RouteGlobalFilter implements GlobalFilter, Ordered {

    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        ServerHttpRequest request = exchange.getRequest();

        String uri = request.getURI().toString();
        long start = System.currentTimeMillis();
        log.info("uri: {}, 请求 start time: {}", uri, start);
        // ===========以上是前置逻辑===========
        return chain.filter(exchange)
                .doFinally(result -> {
                    // ===========以下是后置逻辑===========
                    log.info("uri: {}, 响应 end time: {}, 耗时: {}", uri, System.currentTimeMillis(), System.currentTimeMillis() - start);
                });
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
